User has created a distribution list in outlook. We are using outlook 2007 and Exchange Server 2007. The distribution list has about 30 addresses all the others are working. These addresses are valid because I have sent mail to them outside of the distribution list. I also recreated them at her workstation. Domains are not unusual. NB I have replaced some of the letters with XXXX for privacy's sake.

jonathan@xxxxx.com
The format of the recipient's e-mail address isn't valid. A valid address looks like this: username@contoso.com. Microsoft Exchange will not try to redeliver this message for you. Please check the e-mail address and try sending the message again, or provide the following diagnostic text to your system administrator.

loretta.xxxx@xxxxx-hospice.org.uk
The format of the recipient's e-mail address isn't valid. A valid address looks like this: username@contoso.com. Microsoft Exchange will not try to redeliver this message for you. Please check the e-mail address and try sending the message again, or provide the following diagnostic text to your system administrator.

Really weird. The user sent another message and two addresses bounced back immediately again. Someone else on the distribution list got in touch and said that my name had appeared on the list. Went to the users PC updated it to Service pack 3 deleted the contacts of the two problem recipients. Tried to add again. When adding the email address kept disappearing! It was also suggesting an address and if you accepted that it disappeared again. Turned suggest addresses off and recreated the contacts. Sent a couple of emails and no bounce back. Got back to my desk and found one of the test emails had come through to me. Looked at my smtp settings and the address was there!!!!! Have removed the address from my smtp settings. This is reallly weird. I am postmaster and have postmaster on my smtp settings. We also use a pop3 connector called popcon and I am also listed as postmaster there. Has anybody seen this before?

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